Params Relation not working with Group Fields

Hi, here is the param from group.

array(
    'name' => 'btn',
    'label' => 'Button?',
    'type' => 'checkbox',
    'options' =>
        array(
        'yes' => 'Yes',
    )
),
array(
    'name' => 'btn_text',
    'label' => 'Button Text',
    'type' => 'text',
    'relation' => array(
        'parent' => 'btn',
        'show_when' => 'yes'
        ),
),
array(
    'name' => 'btn_url',
    'label' => 'Button URL',
    'type' => 'text',
    'relation' => array(
        'parent' => 'btn',
        'show_when' => 'yes'
        ),
),

It showing relational fields without clicking checkbox.

Waiting for your reply.

Thanks

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